Motorola Solutions Inc. 99FT4100 Manual De Usuario

• Texas Instrument DM8148 Host/DSP Processor

• EMMC Flash memory

• DDR3 memory

• Texas Instruments Power Management IC

• NOR Flash

• TI AIC3204 Codec

General controller functionality includes:

• Data and Control interface to the transceiver ICs

• Audio interface with CODEC IC

• UART interface to expansion board

• Intermodule communication (SPI, I2C)

• Ethernet port

• USB Device port

• External physical interfaces (connectors, LEDs, external references etc.)

• Station Reference Control

The analog audio stages are used exclusively for external accessories connected through the bottom
RJ-45 accessory connector.

The critical components of the audio circuit are the TI DM8148 processor and a Texas Instruments
AIC3204 dual channel audio codecs. 

Figure 11: SLR 1000 Repeater Audio Block Diagram on page

48

 details the specific interconnects between the critical components.

TI DM8148

(DSP Core)

TI AIC3204

Audio 

Codec

 Accessory 

Connector 

I²C (2)

Audio SSI (4)

TX Audio (Pin 1)

RX Audio (Pin 7)

RFIC SSI (4)

RX Audio 

The repeater digital audio is handled primarily by the DM8148 processor. The TX RFIC generates a
24.576 MHz master clock (MCLK) that the DM8148 uses to drive its McASP SSI interface for the audio
codecs. The bulk of the audio processing is done in the DaVinci’s DSP core. The audio codecs contain
DACs and ADCs and handle the conversion of the digital audio to analog audio and vice versa.

There is one TX audio line routed in from the rear accessory connector. This is TX Audio 1 (Pin 1, used
for analog and slot 1 digital).

MN003557A01-AA
Chapter 3:  SLR 1000 Transceiver Board

48  

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